/* 背景图片 */
body {
    background-color:rgb(206, 206, 206);
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;
}

/* nav顶栏 */
#nav {
    width: 100%;
    height: 70px;
    background-color: #5dc9ffbd;
    position: -webkit-sticky;
    position: sticky;
    top: 0;
}

#nav_list {
    list-style-type: none;
    padding: 0;
    overflow: hidden;
    width: 100%;
    z-index: 49;

}

#nav_list li {
    float: left;
    z-index: 50;
}

#nav_list li a {
    z-index: 51;
    display: block;
    color: white;
    text-align: center;
    padding: 24.5px 16px;
    text-decoration: none;
}

#nav_list li a:hover {
    background-color: #8BC8FF;
}

/*  我们的成员 */
#menmbers {
    background-color: rgba(255, 255, 255, 0.5);
    margin: 25px 5% 75px 5%;
    width: 90%;
    height: 170px;
    border-radius: 15px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

#menmbers h3 {
    position: relative;
    left: 5px;
    top: 5px;
}

.menmbers_div {
    width: 10%;
    margin: 20px 7% 20px 7%;
    float: left;

}

.menmbers_div div h4 {
    margin-left: 0px;
    margin-top: 0;
    text-align: center;
    width: 80%;

}

.menmbers_div div p {
    margin-left: 0px;
    margin-top: 0;
    text-align: center;
    width: 80%;

}

.menmbers_div div img {
    border-radius: 100px;
    width: 75%;
    height: 75%;
    cursor: grab;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

/* 海报 */
#ppt {
    margin: 25px 5% 75px 5%;
    background-color: rgba(255, 255, 255, 0.5);
    width: 90%;
    height: 360px;
    border-radius: 15px;
    z-index: 10;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

#ppt_image {
    float: left;
    width: 73%;
    height: 100%;
    cursor: grab;
}

#ppt_image img {
    width: 100%;
    height: 100%;
}

/* 卡片 */
.Card {
    width: 60%;
    height: 18%;
    border-radius: 8px;
    margin-right: 10%;
    margin-left: 12%;
    min-width: 271px;
}

.Card h2 {
    position: relative;
    left: 5px;
    cursor: grab;
}

.Card p {
    position: relative;
    top: -15px;
    left: 10px;
    margin: 0px 0px;
}

.Cards {
    float: right;
    width: 27%;
    height: 100%;
    background-color: #5dc9ff60;
}

#Cards_title {
    margin-left: 12%;
}

/* API */
#api {
    width: 90%;
    border-radius: 15px;
    height: 200px;
    margin: 25px 5% 75px 5%;
    background-color: rgba(255, 255, 255, 0.479);
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    display: none;
}

#email .api_left {
    float: left;
    margin-left: 1.2%;
    position: relative;
    top: 5px;
    left: 5px;
}

#email .api_right {
    float: right;
    margin-right: 500px;
}

/* 关于我们 */
#about_us {
    width: 90%;
    border-radius: 15px;
    height: 300px;
    margin: 25px 5% 75px 5%;
    background-color: rgba(255, 255, 255, 0.432);
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

#about_us::after {
    filter: blur(20px);
    z-index: -1;
}

#about_us .title {
    position: relative;
    top: 5px;
    left: 5px;
}

#about_us .content {
    margin-left: 1.2%;
}

/* 联系方式 */
.footer {
    width: 90%;
    height: 100px;
    margin: 25px 5% 75px 5%;
    background-color: rgba(218, 218, 218, 0.842);
    color: #256aff;
    /*position: -webkit-sticky;
    position: sticky;*/
    bottom: 0px;
    left: 0px;
    z-index: 50;
    border-radius: 15px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);

}

.footer div p {
    margin-top: 0px;
    margin-left: 10px;
}